...knowing what to look for. When coming from jQuery, also see the card on JavaScript without jQuery. This card includes a link to You Don't Need jQuery, which summarizes...
...most of the alternatives in native Javascript implementation to jQuery methods...
...you understand "impossible" behavior of your tests. When you run a Rack::Test (non-Javascript) test with Capybara, there is a single process in play. It runs both your test...
...and the server responding to the user interactions scripted by your test. A Selenium (Javascript) test has a lot more moving parts: One process runs your test script. This is...
...app, browser: :chrome, options: options) end Before do Capybara.current_driver = :rack_test end Before('@javascript') do Capybara.current_driver = :selenium
...scrolling. This frees the browser up to respond to scrolling immediately without waiting for JavaScript, thus ensuring a reliably smooth scrolling experience for the user. elem.addEventListener('touchstart', fn, { passive: true...
...event on window. It will be emitted for all uncaught errors in the current JavaScript VM: window.addEventListener('error', function(event) { console.log("Got an uncaught error: ", event.error) }) Tip Testing tools like...
...markdown from user input, an attacker might be able to use this to inject javascript code into the source code of your page. The linked github page is a collection...
...common markdown XSS payloads which is handy for writing tests. Producing arbitrary links: [Basic](javascript:alert('Basic')) [Local Storage](javascript:alert(JSON.stringify(localStorage))) [CaseInsensitive](JaVaScRiPt:alert('CaseInsensitive')) [URL](javascript://www.google.com...
...are not written to input fields with fill_in. A workaround is to use javascript / jquery to change the contents of an input field. Use the following code or add...
...unknown reasons. field = find_field(locator) id = field[:id].presence if id execute_script <<~JAVASCRIPT var field = document.querySelector('##{id}'); field.value = #{text.to_json}; field.dispatchEvent(new Event('input')); field.dispatchEvent(new Event('change...
Collection of useful tools in the Chrome JavaScript console. Make the whole page editable This is not special to Chrome, but still a clever thing: document.body.contentEditable=true Taking time
...gem 'jsbundling-rails' group :development, :test do gem 'foreman' # ... end bundle install run bin/rails javascript:install:esbuild in a console to prepare esbuild. run yarn install to install all packages...
...assets:clobber to remove the precompiled assets again. adapt your stylesheet_link_tag and javascript_link_tag to match the new pack names. start the development server with the command...
...using unicode escape sequences: escapeHighASCII('{"foo":"xäy"}') // => '{"foo":"x\\u00e4y"}' Escaping high ASCII in JavaScript function escapeHighASCII(string) { let unicodeEscape = (char) => "\\u" + char.charCodeAt(0).toString(16).padStart(4, '0')
...are a simple animation framework that is built right into browsers. No need for Javascript here. They're supported by all browsers. Basic usage Transitions are used to animate the...
...concept, like a Ruby class attribute (snake_case) that is also exposed to the JavaScript world (camelCase). # This query matches "foobar", "foo-bar" and "foo_bar" # The query is case...
...to livereload-js match[1] end watch(%r(^app/assets/.*\.js$)) do |_match| # Any source Javascript changed. Assume the next changes in public/assets refer to JS. last_js_change = Time.now
port: 35729, } Finally, require this new entrypoint in your layout with - if Rails.env.development? = javascript_include_tag 'dev', nonce: true (skip the nonce, if you do not have a CSP...
...missing an href attribute. This will probably happen to you every now and then on JavaScript-heavy applications. An example would be an AngularJS application where the following HTML actually...
...called a consent management platform (CMP). Your website will load this CMP via a JavaScript tag which will then directly render the form. The form will show the user detailed...
...See https://www.consentstringdecoder.com/ for an example string. The CMP will even inject a standardized JavaScript function called __tcfapi into your website. This can be used by any other third-party...
...to this element. Example DOM Breakpoints can be quite useful to quickly find the JavaScript that is responsible for some (unexpected) behavior. You can use DOM Breakpoints for debugging subtree...
...or node removal. Here you can see a very simple example that shows what JavaScript lines are responsible for a text change (subtree modification): You can use this Code Pen...
All major browsers (IE8+, FF3.5+, Safari 4+, any Chrome) support sessionStorage, a JavaScript storage object that survives page reloads and browser restores, but is different per new tab/window (in contrast...
...query parameter ordering 1 URI ignoring query parameter ordering 2 Tests with AJAX Using javascript in integration tests might cause issues that AJAX requests are not recorded or bleed in...
...from the toolbar. For that, you should listen to the trix-initialize event in javascript. addEventListener("trix-initialize", event => { const { toolbarElement } = event.target const textTools = toolbarElement.querySelector("[data-trix-button-group=text...
...focusable nor visible to screen readers. Alternatives If you're starting your transition from JavaScript, you can give the element the [inert] attribute. This will make the browser ignore input...
...local development where you might still use http://. If you set any cookies from JavaScript, this isn't fixed by the middleware. Add this to lib/middleware/secure_cookies.rb: # On HTTPS requests, we...
testing-library are widely used testing utilities libraries for javascript dependent frontend testing. The main utilities provided are query methods, user interactions, dom expectations and interacting with components of several...
...have many elements on our page. Clicking them should open a modal dialog. Vanilla JavaScript document.addEventListener('click', function(event) { if (event.target.closest('.dialog-link')) { // Open dialog } }); See Event delegation without jQuery...
...be able to click and drag to scroll), or resort to some kind of JavaScript solution...